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Finding the Fourth Proportional to 205.74, 308.97 and 141.66

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Solution

The fourth proportional to 205.74, 308.97 and 141.66 is: 212.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    205.74 : 308.97 = 141.66 : x
  2. Step 2: Convert to fraction form
    205.74/308.97 = 141.66/x
  3. Step 3: Cross multiply
    205.74x = 308.97 × 141.66
  4. Step 4: Simplify right side
    205.74x = 43,768.69
  5. Step 5: Solve for x
    x = 43,768.69/205.74
  6. Step 6: Final answer
    x = 212.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.